Holding in Company

Tullow Oil PLC 10 September 2003 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Name of company Tullow Oil Plc 2. Name of shareholder having a major interest Fidelity Investments 3. Please state whether notification indicates that it is in respect of holding of the shareholder named in 2 above or in respect of a non-beneficial interest or in the case of an individual holder if it is a holding of that person's spouse or children under the age of 18 4. Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them Chase Nominees - 25,470,050 MSS Nominees - 3,393,416 Chase Manhattan London - 2,354,347 Other - 10,372,486 5. Number of shares / amount of stock acquired 6. Percentage of issued class 7. Number of shares / amount of stock disposed 8. Percentage of issued class 9. Class of security 10p Ord. Shares 10. Date of transaction 11. Date company informed 09/09/03 12. Total holding following this notification 41,590,299 13. Total percentage holding of issued class following this notification 11.01% 14. Any additional information 15. Name of contact and telephone number for queries Tom Hickey 0044 207 333 6843 16. Name and signature of authorised company official responsible for making this notification Tom Hickey Date of notification 10 September 2003 This announcement has been issued through the Companies Announcement Service of the Irish Stock Exchange. This information is provided by RNS The company news service from the London Stock Exchange

Companies

Tullow Oil (TLW)
UK 100

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